Sense code 0821000A received with session activation failure

z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures

Sense code 0821000A received with session activation failure

z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
GC27-3667-00

Problem statement: Session activation failed with the sense code 0821000A.
Common symptoms: An attempt to establish a session failed and the sense code 0821000A (mode table not found) was returned.
Probable cause: The sense code indicates that the mode table associated with the LU was not found.
User response: Verify that the specified table exists, and activate it.